Using wild type Aspergillus oryzae isolated from natural fermented millet catsup as original strain(S),several mutated strains were obtained by ultraviolet mutation.

• 以自然发酵的粟米酱中分离的野生型米曲霉为出发菌株(S),经分离、纯化后,采用紫外线诱变育种的方法,获得新的变异菌株。